why duplicate airpods is not working both sides only one side is hearing

I bought airpods which was not original I can’t able to afford now of huge cost later I may but duplicate airpods is not working on one side only I can able to hear on one side .my airpods name is I7airpod can u plz guide me how to resolve this problem .i don’t know problem may also be in pairing also can u help me for this plz